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通过改变F-P腔全光纤激光器中的光纤盘绕半径,对输出激光光束质量进行了研究。搭建了百瓦级全光纤激光器。最大泵浦功率为436 W的条件下,获得了300 W波长1 080 nm的激光输出。光束质量M2=1.13。光-光转换效率为69%。理论分析并计算了20/400μm大模场面积双包层光纤中的两种导波模式LP01模和LP11模沿光纤径向的功率分布和弯曲损耗;利用光纤弯曲选模方法,实验上探究了光纤弯曲半径对输出激光模式及光束质量的影响。实验发现,通过光纤弯曲方式可以有效地消除高阶模式,再经过包层光剥除可以获得更好的光束质量M2=1.06。
The output laser beam quality was studied by changing the fiber coil radius in F-P cavity all-fiber laser. Set up a 100-watt all-fiber laser. With a maximum pump power of 436 W, a laser output of 1080 W at 1 080 nm was obtained. Beam quality M2 = 1.13. Light - light conversion efficiency of 69%. Theoretical analysis and calculation of the power distribution and bending loss of LP01 mode and LP11 mode in the two waveguide modes of 20/400 μm large-mode-area double-clad fiber along the radial direction of the fiber are carried out. By using fiber bending mode selection method, Effect of Fiber Bend Radius on Output Laser Mode and Beam Quality. The experimental results show that the high order mode can be effectively eliminated by the fiber bending method, and the better beam quality M2 = 1.06 can be obtained after clad stripping.